The `getVastXml` function, which is used in the [`localCacheGam.html`](https://github.com/prebid/Prebid.js/blob/master/integrationExamples/gpt/localCacheGam.html#L98) example, is not mentioned anywhere in the docs. It should probably be added to: * The API reference: https://docs.prebid.org/dev-docs/publisher-api-reference.html * https://docs.prebid.org/dev-docs/publisher-api-reference/setConfig.html#client-side-caching-of-vast-xml